FALL RIVER – They built a robot out of discarded parts that can read written language and translate it to Braille. So they probably already knew what Richard Hanna had to tell them. But as three high school students from Chillan, Chile, toured the Amazon fulfillment center on Innovation Way, a conveyor belt moving boxes toward trucks stopped when three boxes got sideward on the line. Hanna, the general manager of the 1.6 million square foot plant, got to the line, pulled the boxes off the belt, got the line moving again and then fed the boxes back into the flow...